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The Gbar project, or how does antimatter fall?

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Abstract

The Einstein classical Weak Equivalence Principle states that the trajectory of a particle is independent of its composition and internal structure when it is only submitted to gravitational forces. This fundamental principle has never been directly tested with antimatter. However, theoretical models such as supergravity may contain components inducing repulsive gravity, thus violating this principle. The GBAR project (Gravitational Behaviour of Antihydrogen at Rest) proposes to measure the free fall acceleration of ultracold neutral antihydrogen atoms in the terrestrial gravitational field. The experiment consists in preparing antihydrogen ions (one antiproton and two positrons) and sympathetically cool them with Be+ ions to a few 10 μ K. The ultracold ions will then be photoionized just above threshold, and the free-fall time over a known distance measured. In this work, the GBAR project is described as well as possible improvements that use quantum reflection of antihydrogen on surfaces to use quantum methods of measurements.

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Authors and Affiliations

  1. CSNSM, CNRS, IN2P3, Université Paris Sud - Paris XI, Orsay, France

    G. Chardin, P. Grandemange, D. Lunney & V. Manea

  2. IPP, ETHZ, 8093, Zürich, Switzerland

    A. Badertscher, P. Crivelli, A. Curioni, A. Marchionni, B. Rossi & A. Rubbia

  3. Institut Laue-Langevin (ILL), 6 rue Jules Horowitz, 38042, Grenoble, France

    V. Nesvizhevsky

  4. IRFU, CEA, Saclay, 91191, Gif-sur-Yvette Cedex, France

    D. Brook-Roberge, P. Comini, P. Debu, P. Dupré, L. Liszkay, B. Mansoulié, P. Pérez, J.-M. Rey, B. Reymond, N. Ruiz, Y. Sacquin & B. Vallage

  5. Laboratoire Kastler Brossel, École Normale Supérieure, CNRS, Université P. et M. Curie – Paris 6, Case 74; 4, place Jussieu, 75252, Paris CEDEX 05, France

    Paul Indelicato, F. Biraben, P. Cladé, A. Douillet, G. Dufour, S. Guellati, L. Hilico, A. Lambrecht, R. Guérout, J.-P. Karr, F. Nez, S. Reynaud, C. I. Szabo, V.-Q. Tran & J. Trapateau

  6. Université d’Evry Val d’Essonne, Évry, 91025, France

    A. Douillet, L. Hilico & J.-P. Karr

  7. Atomic Physics Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan

    A. Mohri & Y. Yamazaki

  8. Department of Physics, Swansea University, Swansea, SA2 8PP, UK

    M. Charlton, S. Eriksson, N. Madsen & D.P. van der Werf

  9. Institute of Physics, University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo, 153-8902, Japan

    N. Kuroda & H. Torii

  10. Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo, 162-8601, Japan

    Y. Nagashima

  11. Johannes Gutenberg-Universität Mainz, Institut für Physik, QUANTUM, Staudingerweg 7, 55128, Mainz, Germany

    F. Schmidt-Kaler, J. Walz & S. Wolf

  12. Université de Strasbourg (UDS), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Département d’Optique ultrarapide et de Nanophotonique (DON), 23, rue du Loess - BP, 43 - 67034, Strasbourg Cedex, France

    P.-A. Hervieux & G. Manfredi

  13. P. N. Lebedev Physical Institute, 53 Leninsky Prospect, 117924, Moscow, Russia

    A. Voronin & P. Froelich

  14. National Centre for Nuclear Research, 05-400, Otwock, S̀wierk, Poland

    S. Wronka & M. Staszczak

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  1. Paul Indelicato
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Correspondence to Paul Indelicato.

Additional information

Proceedings of the 11th International Conference on Low Energy Antiproton Physics (LEAP 2013) held in Uppsala, Sweden, 10–15 June, 2013

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Indelicato, P., Chardin, G., Grandemange, P. et al. The Gbar project, or how does antimatter fall?. Hyperfine Interact 228, 141–150 (2014). https://doi.org/10.1007/s10751-014-1019-6

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